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【单选题】
合成乙酸乙酯时,为了提高收率,最好采取何种方法?A.
氟乙酸
B.
氯乙酸
C.
溴乙酸
D.
碘乙酸
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The ______ of seawater into drinking water is a complicated problem.
A.
conversion
B.
conjecture
C.
concession
D.
contraction
【简答题】试述母乳喂养的优点。
【简答题】试述母乳喂养的优点。
【单选题】The ballasting pump can be replaced with the main seawater pump. 02010503
A.
The main seawater pump can be replaced with the ballasting pump.
B.
The main seawater pump can replace the ballasting pump.
C.
The ballasting pump can be replaced with the fire-fighting pump.
D.
The ballasting pump can be replaced with the auxiliary seawater pump.
【单选题】___ with a gradual rise of seawater, some nations in the Pacific are considering moving in the near future. [ ]
A.
Facing
B.
To face
C.
Faced
D.
Being faced
【单选题】The exposed portion of the outboard propeller shaft is protected against seawater corrosion by____
A.
A layer of oxidation formed when the metal of the shaft is exposed to seawater
B.
A covering of plastic, rubber, or shrunk-on compositon sleeve
C.
A corrosion-resistant paint
D.
A heavy lubricant
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