两颊潮红、鼻翼煽动、唇有疱疹、咳嗽时表情痛苦，常见于( )A_爱下问搜题

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问题单项选择题

两颊潮红、鼻翼煽动、唇有疱疹、咳嗽时表情痛苦，常见于( )

A．风湿性心脏病二尖瓣狭窄

B．伤寒

C．脑膜炎

D．大叶肺炎

E．脱水

答案

参考答案：D

完形填空

完形填空。

Kate Smith is a student. She __1__ a brother and a sister. __2__ are Jack Smith and Jenny Smith.
They all __3__ sports. Kate __4__ baseball. Jack likes soccer and Jenny likes ping-pong ball. Their
mother gives (给) __5__ lots of food every day.

( )1. A. have
( )2. A. They
( )3. A. likes
( )4. A. likes
( )5. A. their

B. has
B. them
B. is like
B. like
B. them

C. is
C. their
C. like
C. to like
C. they

选择题

如图，足够长的U型光滑金属导轨平面与水平面成角（0＜＜90°),其中MN平行且间距为L，导轨平面与磁感应强度为B的匀强磁场垂直，导轨电阻不计。金属棒由静止开始沿导轨下滑，并与两导轨始终保持垂直且良好接触，棒接入电路的电阻为R，当流过棒某一横截面的电量为q时，帮的速度大小为，则金属棒在这一过程中

A．F运动的平均速度大小为

B．平滑位移大小为

C．产生的焦二热为

D．受到的最大安培力大小为