乳化液箱是储存、回收、过滤和（）乳化液的设备。
A.供液
B.放液
C.沉淀
参考答案：C
用所给动词的适当形式填空。
1. Let my brother _______ (help) you.
2. Look! Jeff with his friends _______ (play) basketball happily on the playground.
3. Is it fine today? No, it's _______ (cloud).
4. How many _______ (umbrella) can you see in the shop?
5. She wants _______ (drink) a cup of coffee.
6. There are a lot of _______ (cloudy) in the sky at the moment.
7. My pen pal is an _______ (America) girl.
露天作业挖掘机或前装机铲装时，爆堆高度不应大于机械最大挖掘高度的( )倍。
A．0.8B．1.2C．1.5D．2
playground.