人在笑时,面部表情有哪些特征()
A.面颊上升
B.嘴角上翘
C.眼周围肌肉堆起
D.五官为聚拢式
参考答案:A, B, C, D
一个家庭所有用电器总功率是2000W,则安装电能表时,最最好选用以下哪种电能表( )
A.220V 2.5A
B.220V 3A
C.220V 5A
D.220V 10A
Those areas rely on agriculture almost ______, having few mineral resources and a minimum of industrial development.'
A.respectively
B.exclusively
C.incredibly
D.extraordinarily