大田喷杆式喷雾机的喷雾高度过低，会引起（）
A、重喷
B、漏喷
C、飘失
D、雾滴穿透性降低
参考答案：B
如果80+x-y和70-x+y的值相等，均等于m，那么m的值为______．
It’s common knowledge that ________ United States is one of ______ biggest developed countries in the world.
A．the; /
B．/; the
C．the; the
D．/ ; /
