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【单选题】
某发电机一变压器组装有经负序增量元件开放的阻抗后备保护，在交流电压回路一，且伴随系统操作时误动作，其主要原因是（）。A.
动作阻抗整定不正确，没有躲过负荷电流
B.
负序增量元件整定过于灵敏，未能躲过操作时的不平衡电流
C.
没有设置电压回路断线或断线不正确
D.
以上均不正确
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【单选题】The US is, by any reasonable measure, a ______________.
A.
plutocracy
B.
autocracy
C.
theocracy
D.
kleptocracy
【简答题】We'll keep you ______ any news. [A]up to date with [B]in step with [C]in line with [D]in terms of
【单选题】Questions 下列各 are based on the followingpassage. Byalmost any measure, there is a boom in Intemet-based instruction. In just a fewyears,34 percent ofAmerican universities have begun offering some form...
A.
Allits courses are offered online.
B.
Itsonline courses are of the best quality.
C.
It boasts the largest number of studentson campus.
D.
Anyone taking its online courses is sure to get a degree.
【单选题】果园里有桃树200棵,____梨树有多少棵?补上下面的条件,列式为200×(1+15%)
A.
梨树的棵数是桃树的15%
B.
梨树的棵数比桃树多15%
C.
梨树的棵数比桃树少15%
D.
桃树的棵数是梨树的15%
【单选题】( Paragraph C)In the First Wave of computing,_________________ .
A.
computing had awareness of their surroundings and connected things together
B.
people had access to everything through mobile computing
C.
companies operated their business by means of computer systems
【单选题】In cloud computing, services are typically offered using ______________.
A.
private clouds
B.
heterogeneous grids
C.
a utility computing model
D.
edge computing
【单选题】(Para C) In the First Wave of computing,_________________ .
A.
computing had awareness of their surroundings and connected things together
B.
people had access to everything through mobile computing
C.
companies operated their business by means of computer systems
【简答题】果园里有桃树200棵，比梨树的 1 5 少50棵，果园里有梨树多少棵？
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