Arabic is written in the opposite direct

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问题选择题

Arabic is written in the opposite direction to English, _____, from right to left. [ ]

A. that is

B. which is

C. what is

D. as it is

答案

答案：A

填空题

计算：3tan30°-2sin60°=______，（tan60°）^2tan45°=______．

选择题

如图27所示，电阻R₁=20Ω，电动机绕线电阻R₂=10Ω，当电键S断开时，电流表的示数是I₁=0.5A,当电键合上后，电动机转动起来，电路两端的电压不变，电流表的示数I和电路消耗的电功率P为多少？

A．I="1.5A"

B．I<1.5A

C．P="15W"

D．P<15W