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【单选题】
晶体三极管处于放大工作状态，测得集电极电位为6V，基极电位0.7V，发射极接地，则该三极管为( )型。A.
NPN
B.
PNP
C.
N
D.
P
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举一反三
【单选题】Some crops are relatively high yielders and could be planted in preference to others to ______ the food supply.
A.
enhance
B.
curb
C.
disrupt
D.
heighten
【简答题】数据服务平台指的是利用传感器、无线通讯、大数据、云计算、物联网、人工智能等技术进行数据采集分析，通过可视化展示，对农作物的生长情况进行_______、病虫害监测，对农作物的产量进行预估。
【单选题】某男,45岁。上腹阵发性疼痛,并腹胀.呕吐.停止肛门排气2天。体检:腹胀,见肠型,腹软,轻度压痛,肠鸣音亢进。病人半年前曾作阑尾切除术。目前该病人发生的肠梗阻类型,不可能是( )
A.
急性肠梗阻
B.
完全性肠梗阻
C.
绞窄性肠梗阻
D.
单纯性肠梗阻
E.
机械性肠梗阻
【单选题】－What are on show in the museum?－Some pictures ____ by middle－school students.A．takingB．having be
A.
31.－What are on show in the museum? －Some pictures ____ by middle-school students. A．taking
B.
having been taken
C.
taken
D.
being taken
【单选题】He planted some flowers on the balcony that over the street.
A.
projected
B.
cut
C.
distorted
D.
were
【单选题】- What are on show in the museum? - Some pictures______by middle-school students.
A.
taking
B.
having been taken
C.
taken
D.
being taken
【简答题】He planted some flowers on the balcony that____________________over the street.
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