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【单选题】
有人选用 I CM =20 mA , U (BR)CEO =22 V , P CM =100 mW 的三极管组成放大电路,其静态工 作点 I CQ =10 mA , U CEQ =15 V ,则该管A.
可以正常放大
B.
可能击穿
C.
放大性能较差
D.
将过热或烧坏
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举一反三
【简答题】The most often used reinforcing agents are carbon black and ( ).
【单选题】The use of sinking and dispersing chemical agents for removal of surface oil is ______.
A.
the most common method used in the United States
B.
too expensive for common use
C.
generally safe to sea life
D.
authorized only with prior approval of the Federal On-Scene Coordinator
【单选题】All are alkylating agents used in chemotherapy EXCEPT:
A.
Melphalan
B.
Busulfan
C.
Cladribine
D.
Cyclophosphamide
【单选题】Agents that are used to inhibit bacterial growth are considered
A.
bacteriocidal
B.
bacteriostatic
C.
antiseptics
D.
disinfectants
【单选题】Fire extinguishing agents used on Class C fires must be（）.
A.
able to absorb heat
B.
water based
C.
nonconducting
D.
nontoxic
【单选题】患者女,24岁。背部出现一片稍隆起的紫红色浸润区,界限不清,表面有突起的脓点,疼
A.
轻。6天后出现皮肤坏死破溃，呈火山口状，并伴有寒战、高热、食欲减退等症状。首
B.
考虑为
C.
疖
D.
急性蜂窝织炎
E.
痈
F.
急性淋巴结炎
G.
网状淋巴管炎
【判断题】Agents are middlemen who buy in large quantities from the producers and redistribute the goods to the middlemen at the next level retailers.()
A.
正确
B.
错误
【单选题】Before the age of the Internet, we used to ______ our holidays through travel agents.
A.
book
B.
having booked
C.
booking
D.
have booked
【多选题】Hyaluronic acid has been used as agents for
A.
joint diseases
B.
cataracts replacement operation
C.
blood transfusion
D.
cosmetics
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