如果风机故障跳闸，而在跳闸前未见（）时，跳闸后可重合闸一次。

下列关于安全措施等级顺序的要求应遵循的具体原则的说法中，正确的包括（）。

A.通过合理的设计和科学的管理，尽可能从根本上消除危险和有害因素

B.当消除危险和有害因素存在困难时，可采取降低性技术措施

C.在无法消除危险和有害因素且难以预防的情况下，应采取警告性措施

D.在无法消除、预防和减弱的情况下，应将作业人员与危险和有害因素隔离、

E，当操作者失误或设备运行一旦达到危险状态时，应通过连锁装置终止危险、危害的发生

在生产过程中，凡是改变生产对象的形状、尺寸、相对位置和性质等，使其成为成品或半成品的过程，称为______过程。

A．加工

B．工艺

C．制造

我国改革的实质是

A．解放生产力

B．是一场新的革命

C．社会主义自我完善

D．体制创新

下列国家中，地跨亚欧两大洲的是（　　）

A．中国

B．俄罗斯

C．美国

D．印度尼西亚

Have you had a headache during a test Have you ever been so worried about something that you have a headache or even can’t sleep at night If so, then you know what stress is. Stress is what you feel when you are worried about something. This worry in your mind can make your body feel bad. You may feel angry, sad, scared, or afraid—all of which can give you a stomachache or a headache.
However, there are different kinds of stress. Some kinds of stress are good and others are bad. Good stress might happen when you’re called to answer questions in class or when you have to give a speech. This kind of stress can help you to get things better done. For example, you may do a better job on your test if the stress pushes you to prepare better before the test.
On the other hand, bad stress can happen if stress lasts too long. You may not feel well if your parents are fighting, if a family member is sick, if you’re having problems at school, or if anything else makes you unhappy every day. That kind of stress isn’t going to help you. And it can actually make you sick.
The best way to fight stress is to have a balanced life. Make sure you keep your SELF in mind: Sleep, Exercise, Leisure(休闲), and Food. If you get enough sleep and eat properly, and if you exercise and leave time for fun, you’ll probably feel less stressed.