发动机关车后为什么不把发动机驱动泵电门放到OFF位：（）.A、为

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问题单项选择题

发动机关车后为什么不把发动机驱动泵电门放到OFF位：（）.

A、为了延长发动机驱动泵的使用寿命

B、为了延长闭锁活门的电磁线圈寿命

C、为了防止液压油结冰造成闭锁活门冻结

D、以上B和C

答案

参考答案：B

选择题

当我们正在进行期中考试时，南半球澳大利亚的季节是（　　）

A．冬季

B．春季

C．夏季

D．秋季

句型转换

按要求改写句子。

1. My brother is going to be a violinist. ( 对画线部分提问）

_____ is _____ brother _____ _____ _____?

2. The camera is very old. We can't use the camera. (合为一句)

The camera is _____ _____ for us _____ use.

3. We need three bananas to make a banana milk shake. ( 对画线部分提问）

_____ _____ _____ _____ you need to make a banana milk shake?

4. Vera thought Eliza played the most beautiful piano piece last week. (同上)

_____ did Vera think _____ the most beautiful piano piece last week?

5. Kelly won the prize for the speech contest. (同上)

_____ prize did Kelly _____?