如图所示功率放大电路,输入电压为正弦波,当>0时,()。(设晶体管b-e间开启电压忽

题型:单项选择题

问题:

如图所示功率放大电路,输入电压为正弦波,当>0时,()。(设晶体管b-e间开启电压忽略不计)

A.VT1导通,TV2截止

B.VT1截止,VT2导通

C.VT1导通,VT2导通

D.VT1截止,VT2截止

考点:民航电信人员执照考试模拟电路模拟电路题库
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以帝王的年号纪年是我国古代常用的纪年方法,下列历史文化名词涉及帝王年号的是

A.开元通宝

B.建安文学

C.文景之治

D.澶渊之盟

题型:单项选择题

常温常压下不适宜用物理方法区别的是(  )

A.酒精和食醋

B.汞和铝

C.高锰酸钾和硫

D.氧气和二氧化碳

题型:单项选择题

低胆固醇膳食要求每日胆固醇供应量为()

A.300mg以内

B.50mg以内

C.1000mg以内

D.600mg以内

E.800mg以内

题型:单项选择题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

Is integer x divisible by 48 ?()
(1) x is divisible by 16.
(2) x is divisible by 12.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

题型:单项选择题

现代情感心理学研究表明,人的情感具有以下积极功能()

A、动力功能

B、调节功能

C、疏导功能

D、协调功能

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