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【单选题】
一般用于低速、轻载场合的是A.
圆柱齿轮
B.
斜齿轮
C.
圆锥齿轮
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文：W: Hi, how is everything? Are you ready for the party? M: Yes, just about. It's been crazy trying to organize everything, we haven't even started to think about the wedding yet! W: There are lots...
A.
No, he doesn't like any of them.
B.
Yes, they are being made.
C.
Yes, he has bought them from a shop.
D.
No, he will not wear a wedding ring.
【多选题】测定药物旋光度的注意事项包括：
A.
每次测定前应以溶剂作空白校正，测定后，再校正 1 次，以确定在测定时零点有无变动。如第 2 次校正时发现零点有变动，则应重新测定旋光度。
B.
配制溶液及测定时，均应调节温度至 20 ℃ ±0.5 ℃ （或各品种项下规定的温度）。
C.
供试物质的溶液应充分溶解，供试液应澄清。
D.
表示物质的比旋度时应注明测定条件。
【多选题】测定药物旋光度的注意事项包括（ ）
A.
每次测定前应以溶剂作空白校正，测定后，再校正 1 次，以确定在测定时零点有无变动。如第 2 次校正时发现零点有变动，则应重新测定旋光度。
B.
配制溶液及测定时，均应调节温度至 20 ℃ ±0.5 ℃ （或各品种项下规定的温度）。
C.
供试物质的溶液应充分溶解，供试液应澄清。
D.
表示物质的比旋度时应注明测定条件。
E.
校正仪器的杂散光
【单选题】听力原文：W: Hi, how is everything? Are you ready for the party? M: Yes, just about. It's been crazy trying to organize everything, we haven't even started to think about the wedding yet ! W: There are lot...
A.
No, he doesn't like any of them.
B.
Yes, they are being made.
C.
Yes, he has bought them from a shop.
D.
No, he will not wear a wedding ring.
【单选题】听力原文：M: Did you get everything you need for making the cake? W: I couldn't, but don't worry, I got one from a shop. Q: What can we infer from the conversation? (14)
A.
The woman bought a cake.
B.
The woman baked a cake.
C.
The woman forgot about the cake.
D.
The woman will buy a cake.
【单选题】The captain gave an order in the difficult situation________the sailors throw away everything that was on board the ship.
A.
what
B.
which
C.
as
D.
that
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