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CTC模式定时为什么比普通模式定时精确？
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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 restaurant server usually gives menus to the _____ after he/she seats them in the restaurant.
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.
Westerners often place the knife and spoon on the _____ of the plate and fork on the _____ of the plate.
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