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【简答题】
2-13简述直流伺服电动机的PWM调速换向的工作原理。
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举一反三
【简答题】A:Congratulations. B:Thank you.
【简答题】When I was small, my mum used to give the family something special for meals — she would make breakfast food for dinner. I still remember one night my mum put some bread in front of my dad, something ...
【单选题】A: I'm granted a full scholarship for this semester. B: ______
A.
Congratulations. That's something.
B.
It's very nice of you to say so.
C.
Actually, you owe it all to your friends.
D.
I'm flattered.
【单选题】A: Congratulations! I heard you got a promotion. When was it announced? B: ______.
A.
It wasn't announced.
B.
No, you're wrong.
C.
I've waited too long for the promotion.
D.
You're probably thinking of another person.
【单选题】—My son has got a straight A in all his final exams. — What a ____ boy! Congratulations!
A.
promising
B.
predictable
C.
eager
D.
curious
【单选题】患者男，42岁。体检彩超发现左肝上下径5.7cm，边缘锐利，肝包膜光整，血管纹理清晰，门静脉1.0cm，腔内未探及明显异常回声；肝内胆管未见扩张，肝实质回声均匀。左右肝可探及多个中等回声，左肝最大1.0cm×0.4cm，右肝最大10.5cm×7.5cm×6.3cm，位于右肝前后交界近下缘处，界清。彩超结果（提示：肝脏多发实性病变。CT检查右肝多个散在大小不等的团块状低密度灶，CT值30~48，最大...
A.
肝囊肿
B.
细菌性肝脓肿
C.
肝腺瘤
D.
肝癌
E.
肝血管瘤
【单选题】关于胃黏膜自身保护作用的描述,正确的是( )
A.
覆盖于胃黏膜表面的黏液-碳酸氢盐屏障,防止H+和胃蛋白酶对胃黏膜的侵蚀
B.
胃黏膜上皮细胞顶部的细胞膜与相邻细胞间的紧密连接,有防止H+透过的作用
C.
胃黏膜血流十分丰富,为胃黏膜细胞提供了丰富的代谢原料
D.
胃黏膜局部还存在着自身保护性物质
E.
以上均是
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