工程上常用()来表示金属材料的强度。
A、抗压强度;
B、抗拉强度;
C、抗剪强度;
D、抗弯强度。
参考答案:B
One of the consequences of our planet's being warming up is a(n)________in the number of natural
disasters.[ ]
A. account
B. reason
C. increase
D. occurrence