木材干得越透，质量越好。
参考答案：错
You must ____________ a good mountain bike.[ ]
A. had
B. have
C. has
D. having
LT-1602A液位探头堵塞，清理前探针应处于拉起位（）。
A、全部抽出
B、全部插入
C、抽出一半
D、任意
