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【单选题】
标定NaOH溶液常用的基准物质有A.
无水 Na2CO3
B.
硼砂
C.
CaCO3
D.
邻苯二甲酸氢钾
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【单选题】听力原文：W: Hi, Mike! You missed a great history lecture this morning. Where were you? M: Oh, I overslept again. This really is becoming a bad habit. What did Professor Brown talk about today? W: Can you ...
A.
sheep's teeth.
B.
cow's teeth.
C.
stone.
D.
wood.
【单选题】听力原文：W：Hi，Mike! You missed a great history lecture this morning．Where were you? M: Oh, I overslept again. This really is becoming a bad habit. What did Professor Brown talk about today? W: Can you bel...
A.
A student and a professor.
B.
Two students.
C.
Two dentists.
D.
A dentist and a patient.
【简答题】发动机异响诊断仪主要是根据异响的 、 、 来对发动机异响故障进行诊断。
【单选题】听力原文：W: Hey Taxi! Ah great. Thanks for pulling over. M: Where to? W: Well, I'm going to the National Museum of Art, and... M: Sure. Hop in. No problem. Hang on! W: Uh. Excuse me. How long does it take...
A.
3:40PM.
B.
4:15 PM.
C.
4:30PM.
D.
4:45 下午
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