皮皮学，免费搜题
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【单选题】
气相色谱法手动进样是使用A.
平头微量注射器
B.
尖头微量注射器
C.
均可
D.
均不可
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】Dear Lily, I got your letter and pleased to hear about your job interview at a grocery store. I know you want to get a job at the TV station, and you’ve been looking for several week now and haven’t f...
【单选题】We drove __ several villages before we reached the mountain at last .
A.
through
B.
over
C.
across
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