什么是裂缝的闭合压力?
参考答案:裂缝刚刚能够张开或恰好没有闭合的压力为裂缝的闭合压力。
下列对神经调节和激素调节的叙述错误的是[ ]
A.神经调节迅速而精确,反应时间短
B.激素调节启动较慢,持续时间较长
C.神经调节的基本结构和功能单位是神经元
D.人和高等动物的生理活动主要是通过激素调节协调
句型转换。
1. He has to make dinner at home. (改为否定句)
He ____ ____ to make dinner at home.
2. He has to do his homework after school. (对划线部分提问)
____ does he have to ____ after school?
3. Come to the party at 5 o'clock, please. (改为否定句)
____ ____ to the party at 5 o'clock, please,
4. What else do you have to do? (改为同义句)
What ____ ____ do you have to do?
5. They can play tennis in the gym. (改为一般疑问句)
____ they ____ tennis in the gym?