强度最差的是
A.嵌体 B.甲冠 C.3/4冠 D.金属全冠 E.烤瓷全冠
参考答案:B
根据首字母或汉语提示写出单词
1. The policeman made a polite g_______ at the driver to stop the car.
2. We couldn’t have a picnic because of the s_______ change in the weather.
3. B________ is thicker than water.
4. The children stood _________ (不动)and watched as the deer came closer.
5. It's very _______ (安静的)out here in the woods.
下列叙述逐日平均水位表中水位保证率错误的是()。
A、以水文年为统计时段
B、以日平均水位作确定值
C、日内瞬时水位高于等于某一水位值的天数
D、某站1999年保证率为90d的水位为1236.50m,就是指该年中有275d的日平均水位小于1236.50m。