每个蒸压釜有（）个固定支座和若干个活动支座。
A.1
B.2
C.3
D.4
参考答案：A
选用because或because of填空。
1. _____ his bad leg, he couldn't walk so fast as others.
2. They didn't go swimming _____ it was raining hard.
3. —Why can't you do it now?
—_____ I'm too busy.
4. He didn't come today _____ his illness.
宝马车一般采用何种驱动结构（）
A、FF
B、FR
C、RF
D、RR
