皮皮学，免费搜题
登录
搜题
【单选题】
. A nature reserve for white-flag dolphins was set up in 1992, _______ boats have been prohibited from sailing around since then.A.
where
B.
which
C.
when
D.
what
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】美国某公司进口价值30万美元的40公吨某商品,该商品从量税税率为每千克6美元,从价税为50%,则该批商品按混合税征收的关税税额是
A.
15万美元
B.
24万美元
C.
39万美元
D.
90万美元
【多选题】已知某基本共射放大电路的输出特性曲线如图所示，请问： 1. 静态工作点Q1对应的电源Ucc是 （V） ？ 2.静态工作点Q1的参数I B 是多大 （ μA ）？ 3.静态工作点Q1的参数I C 是多大 （mA） ？ 4.静态工作点Q1的参数U CEQ 是多大 （V）?
A.
12
B.
20
C.
2
D.
6
【简答题】共发射极基本放大电路如图 1 所示。计已知三极管的β =100 , U CC =12V , R B =500k Ω, R C =3k Ω, R L =6k Ω,算 ( 1 )静态工作点 Q ; ( 2 )计算电压放大倍数 ,输入电阻 R i ,输出电阻 R o ; ( 3 )求放大电路不接负载时的电压放大倍数。 图 1
【多选题】已知某基本共射放大电路的输出特性曲线如图所示，请问： 1. 静态工作点Q2对应的电源Ucc是 （V）？ 2.静态工作点Q2的参数I B 是多大 （μA）？ 3.静态工作点Q2的参数I C 是多大 （mA）？ 4.静态工作点Q2的参数U CEQ 是多大 （V）?
A.
6
B.
20
C.
2
D.
3
【单选题】One natural disaster that frequents America are _____, which can hit anywhere along the Gulf Coast or the Atlantic Coast as well as Hawaii in the Pacific Ocean.
A.
tornados
B.
hurricanes
C.
thunderstorms
D.
flooding
【单选题】听力原文： The decade for natural disaster reduction is a program designed to reduce the impact of natural disasters throughout the world. With support from the United Nations, countries will be encouraged...
A.
To predict natural disasters that can cause vast destruction.
B.
To limit the destruction that natural disasters may cause.
C.
To gain financial support from the United Nations.
D.
To propose measures to hold back natural disasters.
【单选题】Choose the correct answer to replace the underlined words. Our answer will be threatened by one natural disaster after another if we don't act now.
A.
not usual
B.
drowned by
C.
in danger of
D.
remarkable
相关题目：
参考解析：
知识点：
题目纠错 0
发布
