The visitor who felt his eyeballs being pulled was probably ______.
A. under the influence of liquor
B. stupid
C. influenced by the power of suggestion
D. playing a joke on everyone
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The official language of Canada is ______.
A. English
B. French
C. Spanish
D. Both English and French
电气装置特征是由独立功能的电气元器件的组合，额定电压大多为10kV或380V/220V，仅在( )中电压有24V或12V。
A. 传输系统
B. 保护系统
C. 控制系统
D. 接地系统
The Australian Federal Parliament is modeled on ______.
A. the Westminster system
B. the White House system
C. the United Nations system
D. the Aboriginal system
设函数f(u)可导，y=f(x2)当自变量x在x=-1处取得增量△x=-0.1时，相应的函数增量△y的线性主部为0.1，则f'(1)=______．
A. -1
B. 0.1
C. 1
D. 0.5
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