哥哥今年20岁,体重2000克.______.(判断对错)
由分析可知:哥哥今年20岁,体重应是40千克左右,
所以题干的说法错误;
故答案为:×.
When they had cleaned their bowls in this way, they would sit __________ at the pot with eager eyes, as if they wanted to eat it.
A.stared
B.staring
C.to stare
D.stares
离心泵启动前应将泵灌满液体,且关闭(),以防倒灌。
A、入口阀
B、出口阀
C、进口和出口阀