在常温的金属,其晶粒越大,金属的强度,硬度越大。
参考答案:错
—It's terribly cold today, isn't it?
—Yes. yesterday.[ ]
A. So it isB.
So is it
C. So was it
D. So it was
艾滋病病毒感染者能够将艾滋病病毒传染给其他人,并且终生具有传染性。