题目内容

一笔汇款金额为1000美元的邮政西联汇款，其汇费为20美元。

A. 正确
B. 错误

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电杆应符合设计规定，其长度偏差为+200mm～-100mm,梢径偏差≤-10mm。

A. 正确
B. 错误

Mary is always ready to help others when they are in trouble and she never__________ their requests.

A. turns up
B. turns over
C. turns in
D. turns down

Everyone has periods in their lives__________everything seems so hard.

A. when
B. where
C. which
D. that

对于混凝土结构、砌体结构、木结构和钢结构，耐久性耐火性均好的有哪些？