問題詳情
77.利用不同粒徑、比重的物料,在液體中有不同沉降速度的原理,將固體混合物分離的方法稱為下列何者?
(A)類析
(B)過濾
(C)沉積
(D)浮選
(A)類析
(B)過濾
(C)沉積
(D)浮選
參考答案
答案:A
難度:計算中-1
書單:沒有書單,新增
內容推薦
- 已知比重 4 的圓球在水中沉降之終端速度為 12 cm/s,若粒徑相同,比重 3 的圓球在水中沉降之終端速度為若干cm/s?(假設層流)(A) 4 (B) 6 (C) 8 (D) 9
- 有關濕度的敘述,下列何者錯誤?(A)對於空氣而言,濕球溫度等於絕熱飽和溫度(B)對於未飽和的空氣而言,濕球溫度小於乾球溫度(C)對於未飽和的空氣而言,相對濕度大於百分濕度(D)露點相同時,乾球溫
- 氣體吸收操作中,氣體速度通常採用:(A)負載速度之 50%至 75% (B)氾溢速度之 50%至 75%(C)負載速度之 2 倍 (D)氾溢速度之 2 倍
- 有關蒸餾操作之敘述,下列何者錯誤?(A)回流比愈大,產品純度愈高 (B)回流比愈大,所需理想板數愈少(C)回流比愈大,重沸器與冷凝器之熱負荷愈少 (D)全回流時,回流比為無限大
- 在某溫度下苯與甲苯之蒸氣壓分別為 1000 mmHg 與 500 mmHg,今有一苯與甲苯之混合溶液之總壓為 800mmHg,與該混合溶液呈平衡之氣相中苯之莫耳分率為若干?(A) 0.40 (B
- 結晶操作中,依照邁耶(Mier)理論,下列何者可使晶體之顆粒變大?(A)急速冷卻溶液 (B)緩慢冷卻溶液 (C)快速蒸除溶劑 (D)加入晶種
- 蒸發操作中為了排除冷凝水,並防止蒸汽之散失,應裝置下列何種附件?(A)冷凝器 (B)袪水器 (C)霧末分離器 (D)晶鹽過濾器
- 有關套管式熱交換器之敘述,下列何者錯誤?(A)以水蒸氣加熱冷流體時,逆流操作之傳熱效率比順流操作高(B)熱敏感性流體之冷卻,通常以順流操作為宜(C)順流操作時冷流體之出口溫度(TC2)絕無法高於
- 某黑體表面溫度由 1000 K 升高至 3000 K,其輻射強度增為原來幾倍?(A) 3 (B) 9 (C) 27 (D) 81
- 流體流過差壓式流量計,若體積流率加倍時,所測得差壓變為原來幾倍?(A) √2 (B) (C) 2 (D) 4
內容推薦
- 有關過濾之敘述,下列何者錯誤?(A)恆速過濾時過濾壓力要逐漸增加 (B)恆壓過濾時濾液流率會逐漸降低(C)恆速過濾初期濾液會混濁 (D)最理想的過濾方式為先恆速再恆壓
- 以固定化酵素代替游離性酵素的最主要優點為何?(A)反應速率快 (B)反應的選擇性高 (C)生成熱量少 (D)酵素容易分離
- Put your snacks in the ______. Don’t eat it in class.(A) frisbee (B) drawer (C) robot (D) woman
- Not many children learn ______ in the deep深 water .(A) building (B) swimming (C) getting (D) fol
- A-li Mountain is a famous ______ spot in Taiwan. People are there for its beautiful scenery(風景).
- Some people live in the big ______with a lot of money, but they are not happy.(A) house (B) club
- Hey! Don’t ________. Your classmates are sleeping . Please be quiet!(A) hurry (B) find (C) fall
- In the park, you can see boys playing with a ______.(A) water (B) factory (C) frisbee (D) house
- The great shops, the good restaurants, and the nice(好的)people—______ here is great. (A) everythi
- The teacher is standing_________the class and talking to them about the coming trip..(A) in (B)
- Son: Mom, I’m going to the movies. See you.Mom: OK. Have _______ith your friends!(A) farm (B) po
- Glory:Let’s go to the party and ______ some fun.Willy:Yes! Yes! Yes!(A) is having (B) are having
- A:Are there any boys in your class? B:Yes, there are ______ boys in my class.(A) a (B) an (C) an
- A:Where is my puppy? In back of the door?B:No, it’s in front ______ the chair.(A) over (B) at (C
- Peter:What time is it ? I am hungry.Wendy:It’s ten______twelve. Time for lunch.(A) on (B) off (C
- Those new i-phones are ______ three colors.(A) at (B) in (C) on (D) under
- Paul: Go and look for the picture in his desk.Tom: Oh,________a lot of things: a basketball, pen
- Julia is late. Look! There she is! She ______ to us.(A) run over (B) is running over (C) run (D)
- Anne: I can’t find Miss Wu. ______ is she?David:I think she is in the Teachers’ Room.(A) Where (
- These puppies are so cute. Let’s play with ______ .(A) they (B) them (C) their (D) him
- Be quiet and read your book! The teacher ______.(A) come (B) coming (C) is come (D) is coming
- The Brown family are in the living room. They are watching TV, and Tom________his dog.(A) is tra
- A:______ is it? B:It is seven ten ______.(A) What; ╳ (B) What time; ╳(C) What; o’clock (D) What
- Grace: I want to write a song. _______ any pencils in your pencil box? Allen: Only one.(A) Are t
- A:We are late for school . What time is it? B:It’s _________.(A) five after seven (B) ten to eig