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【单选题】

What is the emphasis of the following sentence?After shopping at the mall, walking the dogs and washing the car, I finally got to stay in and relax.

A.
Shopping at the mall.
B.
Things I have done.
C.
I finally can relax.
D.
Walking the dogs.
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参考解析:
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举一反三

【单选题】以下质谱联用技术中发展最早的是

A.
GC-MS
B.
HPLC-MS
C.
ICP-MS
D.
MS-MS
E.
第15节 质谱联用技术及其在环境分析中的应用