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【单选题】
已知工频正弦电压有效值和初始值 均 为 380V ,则该电压的瞬时值表达式 ()A.
u=380sin314t V
B.
u=537sin ( 314t +45 °）V
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举一反三
【简答题】测量误差按其性质可分为 : 、
【判断题】"To investigate, to improve, to study carefully, to decide to" is preferrable to "to make an investigation of, to make an improvement, to make a careful study, to make a decision" in writing.
A.
正确
B.
错误
【单选题】治疗犬化脓性骨膜炎时,不宜采取的措施是(2017 真题31)
A.
酒精热绷带
B.
10%醋酸铅冷敷
C.
0.5%普鲁卡因青霉素封闭
D.
红外线照射
E.
切开引流
【简答题】测量误差按其性质可分为哪几类?各有何特征?实际测量中对各类误差的处理原则是什么?
【单选题】She hired a lawyer to investigate, only to learn that Gabriel had removed her name from the deed. The infinitive verb phrase "only to learn" is used .
A.
to express an intended purpose
B.
to indicate a high degree of possibility
C.
to reveal an undesirable consequence
D.
to dramatize a stated fact
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