ICP-AES法测定水样中元素的含量时,为减少空白值应在测定过程中尽量使用()盐酸和硝酸。
A. 化学纯
B. 分析纯
C. 色谱纯
D. 优级纯
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A restaurant server usually gives menus to the _____ after he/she seats them in the restaurant.
A. host
B. guest
C. customer
D. consumer
Mr. Green comes to China for the first time and wants to try some Chinese local food, so he would be ______ to a Chinese restaurant.
A. recommend
B. recommended
C. recommends
D. recommending
Westerners often place the knife and spoon on the _____ of the plate and fork on the _____ of the plate.
A. right, left
B. right, right
C. left, left
D. left, right
You’d better keep your left hand under the table unless you use it in the ______ of cutting.
A. meal
B. course
C. process
D. while