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【单选题】
船舶自动调压器按控制方式分类可分为三大类，即 。A.
开环、闭环和复合控制调压系统
B.
电压、电流和功率因数调压系统
C.
电压、频率和初相位调压系统
D.
有功功率、无功功率和复合控制调压系统
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反馈参考答案：
举一反三
【单选题】–My TV set doesn’t work, the water tap is dripping and my car is still under repair! –You sure ________ bad luck these days.
A.
had
B.
will have
C.
had had
D.
are having
【单选题】Lily’s TV set is broken．She is going to have it ______.
A.
repair
B.
repairs
C.
repairing
D.
repaired
【单选题】–-My TV set doesn’t work, the water tap is dripping and my car is still under repair! –-You sure ________ bad luck these days.
A.
are having
B.
will have
C.
had had
D.
had
【单选题】—Must I go and repair our TV set this afternoon? —No, you _______. I've repaired it. [ ]
A.
mustn't
B.
needn't
C.
shouldn't
D.
wouldn't
【简答题】5-23 某用户 10kV 变电所装有 1 台 1250kVA 干式配电变压器,电压比为 10/0.4kV ,联接组别为 Dyn11 。试依据 GB/ T 50062 — 2008 作出保护配置,整定计算电流保护动作电流,检验保护灵敏性。已知变压器低压侧最大三相短路电流为 21.6kA 、最小三相短路电流为 19.5kA 、最小单相对地短路电流为 18.5kA ,变压器高压侧最小三相短路电流为 7...
【单选题】用额定电压10kV 的试验变压器，测量电容量为20000pF 试品的tg 时，在下列试验变38、 压器容量中最小可选择（ ）kVA。
A.
.5
B.
1
C.
1.5
D.
2
【单选题】用额定电压10kV的试验变压器，测量电容量为20000pF试品的tgδ时，在下列试验变压器容量中最小可选择( )kVA。
A.
0.5;
B.
1.0;
C.
1.5;
D.
2.0。
【单选题】Dee's TV Repair is the only TV repair shop in a small town. Dee is a single-price monopolist. Based on the demand and cost information in the table above, what quantity of TV repairs should Dee undert...
A.
0 per week
B.
10 per week
C.
20 per week
D.
30 per week
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