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【简答题】
一个单位长度上密绕有n匝线圈的长直螺线管，每匝线圈中通有强度为，的电流，管内充满相对磁导率为μr的磁介质，则管内中部附近磁感应强度的大小为______，磁场强度的大小为_______。
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举一反三
【单选题】正常妊娠期间肾功能较非孕期应有下列哪些变化
A.
肾血流量不变，肾小球滤过率增加
B.
肾血流量不变，肾小球滤过率略降低
C.
肾血流量增加，肾小球滤过率增加
D.
肾血流量增加，肾小球滤过率不变
【单选题】分推膻中的具体操作,是下列哪一项( )
A.
中指揉膻中
B.
两拇指至穴中向两旁分推至乳头，又称开胸
C.
用食，中，无名指沿胸骨上下摩擦
D.
用食，中指至胸骨切迹向下推至剑突
【单选题】分推膻中的具体操作是下列哪一项（ ）
A.
用食、中、无名指沿胸骨上下摩擦
B.
中指揉膻中
C.
两拇指自穴中向两旁分推至乳头，又称开胸
D.
用食中指自胸骨切迹向下推至剑突
【单选题】—What a mistake! —Yes. I ______ he do it in another way, but without success.
A.
was suggesting
B.
have suggested
C.
would suggest
D.
had suggested
【单选题】分推膻中的具体操作是下列哪一项（）
A.
中指揉膻中
B.
两拇指自穴中向两旁分推至乳头，又称开胸
C.
用食中指自胸骨切迹向下推至剑突
D.
用食、中、无名指沿胸骨上下摩擦
【单选题】听力原文：M: I think the hostess really went out of her way to make the party a success. W: Yes. The food and drinks were great. But if only we had known a few of the other guests. Q: What did the two spea...
A.
They enjoyed the party better than the other guests,
B.
They knew none of the other guests at the party.
C.
They didn't think much of the food and drinks.
D.
They went a long way to attend the party.
【单选题】—What a mistake! —Yes. I ________ his doing it another way,but with out success. [ ]
A.
was suggesting
B.
will suggest
C.
would suggest
D.
had suggested
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