皮皮学，免费搜题
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【判断题】
国家平面控制网的布设原则是分级布网、逐级控制。A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
举一反三
【简答题】Heat causes the (expand) of gases.
【单选题】— How long do you want me to heat the oil? — Heat it till it _____ to smoke. [ ]
A.
would begin
B.
begins
C.
will begin
D.
began
【简答题】Metals expand with heat and contract with cold. contract:
【单选题】The ideal piston material would not ______. light and strong, conduct heat well, expand only slight when heated, resist wear, and be low in cost.
A.
be light and strong
B.
conduct heat well
C.
expand only slight when heated
D.
be high in cost
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