变异应力
参考答案:
岩体的物理、化学变化及岩浆的侵入等引起的应力。具体来说是岩体的物理状态、化学性质或赋存条件的变化引起的,通常只具有局部意义,可统称为变异应力。
下列关于病理性心悸的描述错误的是()
A.严重贫血者即使休息时亦常感心悸
B.低血糖时释放过多肾上腺素而产生心悸
C.心肌病因心室肥大及心脏扩大而产生心悸
D.活动性肺结核病不会引起心悸
E.嗜铬细胞瘤可引起心悸
用所给词的正确形式。
1. When I ________(give) you a present, you must open it at once.
2. American people eat lots of ________ (hamburger) everyday.
3. Can he ________ (help) me ________ (do) the work?
4. It's too difficult ________ (understand)what you are trying ________ (say).
5. He could see the smoke ________ (rise) from the chimney (烟囱) when he
________ (walk) past your house at this time yesterday.