如图所示,匀强电场的场强为E,A和B两点间的距离为d,AB与电场线夹角为θ,则A

题型:选择题

问题:

如图所示,匀强电场的场强为E,A和B两点间的距离为d,AB与电场线夹角为θ,则A与B两点间的电势差为(   )

A.Ed

B.Edcosθ

C.Edsinθ

D.Edtanθ

考点:电势差与电场强度的关系
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划线字注音有错误的一项是:(       )

A.可hán妖ráo禁gù 妄自薄fěi

B.哑yīn动chàn立zhù 免冠徒xiǎn

C.钝nú然fó社jì 斜晖脉脉mài

D.褓qiǎng 留zhì 田艋舟zé

题型:选择题

动脉性肺动脉高压不包括()。

A.特发性

B.家族性

C.新生儿持续性

D.相关疾病/因素所致

E.肺发育异常

题型:选择题

Have you ever heard your own voice "Of course," you say.
Has anyone else ever heard your voice Again you say, "Of course. "
But that’ s not quite true. Nobody else has ever heard your voice—the way you hear it. When you talk, you set up sound waves. The air outside your head carries the sound waves to your outer ears. But, of course, the sound of your voice begins inside your head. The bones of your head pick up the sound waves, too. They carry the sound waves straight to your inner ears. You get the sound from the outside and the inside too. Other people get just the sound waves from the outside. That’s why they don’t hear your voice the way you do.

When you talk, other people hear your voice ______.

A.through the bones of your head

B.from the outside

C.from the inside

D.all of the above

题型:选择题

心脏病患者拔牙禁忌证中,哪项可除外

A.充血性心力衰竭

B.未控制的心律不齐

C.6个月内发生过心肌梗死

D.完全性右束支传导阻滞

E.不稳定或近期开始发作的心绞痛

题型:选择题

统计GDP以常住居民为标准,常住居民是指在国境内居住满一年的人。( )

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