根据各种称重传感器不同的转换原理可将传感器分为几种模式。以下哪种属于()
A.电子应变式
B.差动变压器式
C.电容式
D.压磁式
E.压电式
参考答案:A, B, C, D, E
为何晶体产品有较高的纯度?
— He is crazy about computer games.
— It isn't surprising _______ he isn't doing well in his study recently. [ ]
A. whether
B. that
C. why
D. what