用比值法定义物理量是物理学中一种常用的方法,下面四个物理公式不属于比值定义法的是

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问题:

用比值法定义物理量是物理学中一种常用的方法,下面四个物理公式不属于比值定义法的是  (   )

A.电场中某点的电势 Φ=

B.磁感应强度

C.电阻

D.电场强度

考点:电场强度的定义式
题型:选择题

阅读短文选择正确答案。

      An old woman had a cat. The cat was very old. She could not run quickly, and she could not bite, because

she was so old. One day, the old cat saw a mouse. She jumped and caught the mouse. But she could not bite it,

so the mouse got out of her mouth and ran away.

      Then the old woman became very angry because the cat did not kill the mouse. She began to hit the cat. The cat said: " Do not hit your old servant (仆人). I have worked (已经工作) for you for many years, and I would

work for you still, but remember what good work the old did when they were young."

1. The cat couldn't run and bite, because she was ___________. [ ]

A. so old

B. so strong

C. so tired

2. When the cat saw the mouse, she _____________.[ ]

A. jumped, but didn't catch the mouse

B. still sat on the floor

C. jumped and caught the mouse

3. The cat caught a ____________.[ ]

A. bird

B. mouse

C. fish

4. The cat ______________, so the mouse got out of the cat's mouth. [ ]

A. was very kind

B. was not hungry

C. could not bite the mouse

5. The old woman ______________ to hit the cat.[ ]

A. begin

B. began

C. begun

6. The old woman became angry, because the cat ______________. [ ]

A. ate the mouse

B. could not see clearly

C. did not kill the mouse

7. The cat told the woman to remember ______________[ ]

A. what good work the old did when they were young.

B. do not be kind to the old.

C. she would not work for the old woman any longer.

题型:选择题

不属于ELISA的方法是()

A.间接法

B.中和反应

C.IgM捕获ELISA

D.竞争法

E.双抗体夹心法

题型:选择题

催产和引产:用()。

题型:选择题

下列变化产生的能量是化学变化的结果的是(  )

A.地热发电

B.核反应发电

C.火力发电

D.风能发电

题型:选择题

对72型防毒面具的管理要求有哪些?

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