若双曲线x2+ky2=1的离心率是2，则实数k的值是______．

请根据汉语提示写出单词的正确形式

1. Our country has become self-sufficient in ______ (粮食).

2. The road signs _________(使糊涂) the driver.

3. The only way to do that is to ______ (减少) expenses.

4. The school _________(提供) books for children.

5. We took the opportunity to _______(交流) experience with them.

6.He has a             (晒黑的) face and bright eyes.

7. The ________ (斗争) for independence was long and hard.

8. The factory must increase its ________(产量).

9. They ________(用掉) all their strength in trying to climb out.

10. Our army is well _______ (装备).

哪项不符合肺上沟瘤（）

A.胸肩痛

B.臂丛神经受累

C.上睑下垂

D.瞳孔缩小

E.眼球突出

艾叶来源于（）科植物。

旋转阳极启动的定子线圈安装在

A．控制台内
B．球管内阳极端
C．球管内阴极端
D．高压发生器内
E．管套中央部

关于电子邮件保密，（）是最重要的并且推动着其他几项。

A.程序

B.政策

C.标准

D.指南