下列选项中，不属于硬质岩石的有( )。
A．石灰岩
B．黏土岩
C．如页岩
D．玄武岩
E．闪长岩
参考答案：B,C
----Can we find before an earthquake?
----Yes. Some animals will run wildly and some plants will come out in the wrong season.
A．something unusual
B．anything unusual
C．unusual something
D．unusual anything
牵引变压器常用的结线方式有哪几种？
