问题
单项选择题
在没有通电的飞机上,左发火警按钮松出,按压灭火剂电门1和2,则发动机灭火瓶1和2号()
A.1,2号都释放
B.1,2号都不释放
C.1号释放,2号不释放
D.2号释放,1号不释放
答案
参考答案:C
在没有通电的飞机上,左发火警按钮松出,按压灭火剂电门1和2,则发动机灭火瓶1和2号()
A.1,2号都释放
B.1,2号都不释放
C.1号释放,2号不释放
D.2号释放,1号不释放
参考答案:C
综合填空。根据短文内容,用所给单词的适当形式填空。 | |
change will take place 3 2050? Now we have some modern factories. They can produce products with high quality (质量). And some people are looking for better ways 4 free time. They want 5 a happy life. So catching up with the changes of the world is a great challenge for the young people. 1.________ 2.________ 3.________ 4.________ 5.________ |