题目内容

光滑圆柱铰链在受力图上可表示为一对。

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约束力的作用点在接触点位置处，方向与该约束所能阻碍的位移方向，大小由决定。

Fill in the blank with a word chosen from the below in its proper form.1. The ____ system is a network consisting of blood, blood vessels, and the heart.2. We can work with immediate family members and representatives to close the account of a person where appropriate.3. Now in many countries, you can register your consent to become an organ and tissue _ online.4. The type of organ _ you experience depends on its timing after transplant.5. resuscitation is a lifesaving technique useful in many emergencies, including a heart attack or near drowning.6. Many organ _ coordinators are registered nurses with an extensive surgical background.7. An drug helps control, or suppress, the immune system in order to slow down the symptoms of severe eczema.8. A skin ____ is where healthy skin is removed from an unaffected area of the body and used to cover lost or damaged skin.

Match the Chinese to English.

选择弹簧隔振器时，下列（）正确。

A. 设备的运转频率与弹簧隔振器垂直方向的固有频率之比，应大于或等于2.5,宜为4~5
B. 弹簧隔振器承受的载荷，不应超过允许工作载荷
C. 当共振振幅较大时，宜与阻尼大的材料联合使用
D. 弹簧隔振器与基础之间宜设置- 定厚度的弹性隔振垫