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【简答题】
什么是特殊儿童?特殊儿童有几类?
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反馈参考答案：
举一反三
【单选题】An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the _____.
A.
propeller hub
B.
lignum vitae
C.
shaft packing
D.
labyrinth seal
【多选题】What behaviors will be prevented from entering China by the frontier inspection station?
A.
A passenger who may jeopardize national security and social order after entering China.
B.
A passenger who does not hold a valid passport and visa.
C.
A passenger who suffers from AIDS, venereal disease and leprosy.
D.
A passenger who is involved with a pending civil case.
【单选题】The tourist is prevented from entering a country if he does not have a (n) passport.
A.
operative
B.
effective
C.
valid
D.
efficient
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