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【简答题】
某工厂有一台315kVA的三相变压器，原有负荷为210kW，平均功率因数为0.7，试问此变压器能否满足供电需要？现在生产发展负荷增到280kW，问是否要增加变压器容量？若不增加变压器容量，可采取什么办法？
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举一反三
【简答题】He is becoming more and more (act) ______ in sports and music.
【单选题】.He went to the States in 1910,by _________ time he had learnt to dance and act in comedies.
A.
that
B.
the
C.
which
D.
whose
【单选题】. He _______ to act out the story he had read, but he failed.
A.
deserved
B.
tried
C.
managed
D.
pretended
【单选题】When he was the director of the company, his first accomplishment was to improve the working conditions.
A.
plan
B.
purpose
C.
achievement
D.
task
【单选题】奶酪是由牛乳腺上皮细胞分泌的乳汁浓缩制成的营养品。检测得知，牛乳汁中含有乳糖、乳脂、酪蛋白、抗体等成分。下列叙述正确的是（ ）。
A.
利用双缩脲试剂可检测并鉴别出酪蛋白或抗体
B.
乳糖可直接被细胞吸收参与能量代谢
C.
乳脂的合成、抗体的加工均需内质网参与
D.
酪蛋白可被小肠上皮细胞以主动运输的方式吸收
【单选题】He ______ unwisely, but he was at least trying to do something helpful[1999]
A.
may have acted
B.
must have acted
C.
should act
D.
would act
【简答题】He is ardently______(act)for the cause of environmental protection.
【单选题】- ______ he _____ on the farm(农场)? -Yes, he does. He' s a good farmer. [ ]
A.
Does, work
B.
Is, working
C.
Does, do
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