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【单选题】
生产厂房的电梯，在使用前有关部门检验合格，取得（）并制订安全和定期检修维护制度。电梯应有专责人维护管理。电梯的安全装置、自动装置、机械部分、信号照明等有缺陷时必须停止使用，并采取必要的安全措施，防止高空等摔跌等伤亡事故。A.
使用证
B.
操作证
C.
合格证
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举一反三
【简答题】最早正式使用“班级”一词的著名教育家是____________。
【单选题】New oak tables are normal goods. What would happen to the equilibrium price and quantity in the market for oak tables if the price of maple tables rises, the price of oak wood rises, more buyers ente...
A.
Price will fall and the effect on quantity is ambiguous.
B.
Price will rise and the effect on quantity is ambiguous.
C.
Quantity will fall and the effect on price is ambiguous.
D.
Quantity will rise and the effect on price is ambiguous.
【单选题】New oak tables are normal goods. What would happen to the equilibrium price and quantity in the market for oak tables if the price of maple tables rises, the price of oak wood rises, more buyers ente...
A.
Price will rise and the effect on quantity is ambiguous.
B.
Quantity will fall and the effect on price is ambiguous.
C.
Quantity will rise and the effect on price is ambiguous.
【单选题】There a film tomorrow night.
A.
have
B.
is going to have
C.
will have
D.
is going to be
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