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【单选题】
剧毒化学品的生产、贮存、使用单位，应当对剧毒化学品的产量、流向、贮存量和用途如实记录，并采取必要的保安措施，防止剧毒化学品被盗、丢失或误售、误用；发现剧毒化学品被盗、丢失或者误售、误用时，必须立即向当地（ ）报告。A.
人民政府
B.
企业上级主管部门
C.
安全生产监督管理部门
D.
公安部门
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【单选题】In the squirrel-cage motor, the speed of the rotor is _______ than the speed of the magnetic field.
A.
greater
B.
less
【简答题】将抗生素注入人体会产生抗生素与血浆蛋白质结合的现象,以致减少药效。现将 5 中常用的抗生素注入牛的体内,得到抗生素与血浆蛋白质结合的百分比如表 : 进行 的统计结果:统计量 = ,P = ,根据检验水准, (接受或拒绝)原假设,结论: 这5种抗生素引起的抗生素与血浆蛋白结合的百分比 (有或无)显著差异。 (注:1.保留小数点后三位,2.统计方法选择有:单个样本均值t检验、配对设计样本t检验、两个独...
【单选题】The ______ cage rotor induction motor is the first choice marine motor in most modem ships because of its electrical and mechanical simplicity.
A.
single phase
B.
two phase
C.
three phase
D.
four phase
【单选题】The _____, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity.
A.
single phase
B.
two phase
C.
three phase
D.
four phase
【单选题】The rotor of a squirrel-cage motor is constituted by a system of bars, which are _____ by two rings located on the extremities.
A.
open in short-circuit
B.
closed in short-circuit
C.
closed in break-circuit
D.
open in break-circuit
【单选题】The ___ , cage rotor induction motor is the first choice of marine motor in most modern ships because of its electrical and mechanical simplicity.
A.
single phase
B.
two phase
C.
three phase
D.
four phase
【单选题】The ____, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity.
A.
two phase
B.
three phase
C.
single phase
D.
four phase
【判断题】In squirrel cage induction machine, the rotor winding is short circuited.
A.
正确
B.
错误
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