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【判断题】
=220sin314tV滞后 =311sin(628t+55°)V 55°电角。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】What must you do when you receive a present for your birthday? You have to sit down and write a thank-you note. The word “thanks” is very important. We have to use them very often. We say them when so...
【简答题】What must you do when you receive a present 56 your birthday? You have to sit down and write a thank-you note. The words “Thank you” are 57 important. We have to use them very often. We say them when ...
【单选题】流脑皮疹的特点应除外
A.
出血性皮疹为淤点或淤斑
B.
皮疹分布于全身皮肤及黏膜
C.
大片淤斑中央可呈紫黑色坏死或大瘢痕
D.
在恢复期10%的病人可出现口唇疱疹
E.
淤点、淤斑是诊断流脑的必备体征
【单选题】海滩上常见“车螺”（学名“文蛤”）与“刺螺”两种贝壳，“车螺”外壳光滑，“刺螺”外壳有很多刺，当不小心踩到“刺螺”上时会很痛，甚至伤脚，这是因为踩“刺螺”时（ ）
A.
压力变大
B.
压力变小
C.
压强变大
D.
压强变小
【单选题】Students show great enthusiasm in ______ the new learning.
A.
providing
B.
pursuing
C.
conjuring
D.
stumbling
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