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【简答题】
电力电子器件一般工作在__________状态;在器件开关频率很低情况下,电力电子器件功率损耗主要为_______损耗,而当器件开关频率较高时,功率损耗主要为_______损耗。
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【简答题】There needs to be a balance between the needs of ______ living in developed environments and the preservation of natural habitat.
【单选题】When issuing IP protection, an important matter is ______.
A.
the balance between the interests of the inventor or author and that of the society.
B.
the balance required by zoning laws
C.
the balance between the interests of land owners and that of the society
D.
the balance between the attempt of protection and the real practice
【单选题】— When are you going to have your hair _____ ? — This afternoon. [ ]
A.
cut
B.
to cut
C.
cutting
【单选题】下面有关精神发育迟滞描述不正确的是?
A.
个体在19岁之前
B.
精神发育迟滞或受阻
C.
造成智力低下和社会适应不良
D.
病因有染色体异常，母孕期感染等
E.
中度精神发育迟滞智商在35-49之间
【单选题】以下关于精神发育迟滞(MR)描述不正确的是（） A．10低于70就可以说明儿童存在精神发育迟滞 B．MR的儿童在言语交流、家庭生活、社交技能、社区设施的应用、掌握自我方向等 多个方面可能存在困难 C．MR儿童往往伴有运动、语言、情绪
A.
a
B.
b
C.
c
D.
d
E.
e
【单选题】My advice to you is to________alcohol at once and stay away from it forever. [ ]
A.
cut out
B.
cut off
C.
cut up
D.
cut in
【简答题】The balance between jobs and the environment Can be kept if____
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