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【单选题】
We all know that we ________ our carbon footprint, but I suspect that many people wouldn't be prepared to go as far as Joan Pick, a retired scientist living in south London.A.
must have reduced
B.
should have reduced
C.
may have reduced
D.
could have reduced
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【简答题】在如图T1所示电路中,已知V CC =12V,晶体管的b=100, =100kΩ。填空:要求先填文字表达式后填得数。 (1)当 =0V时,测得U BEQ =0.7V,若要基极电流I BQ =20μA, 则 和R W 之和R b =____≈____kΩ;而若测得U CEQ =6V,则R c =____≈____kΩ。 (2)若测得输入电压有效值 =5mV时,输出电压有效值 =0.6V, 则电压放大...
【单选题】Transportation in the U.S. Railroads are paths of parallel metal rails that allow a wheeled vehicle to move more easily by reducing friction. Iron mils were first used in the early 1800s to guide hors...
A.
Y
B.
N
C.
NG
【简答题】A. cycled B. drove C. wheeled D. fled
【单选题】This kind of metal ______ well，and therefore the metal stick ______ into halves easily. [ ]
A.
is cut，is cut
B.
cuts，cuts
C.
is cut，cuts
D.
cuts，is cut
【多选题】申请个人汽车贷款，借款人须提供一定的担保措施，包括（ ）
A.
纯车辆抵押
B.
“车辆抵押+担保机构”
C.
“车辆抵押+自然人担保”
D.
“车辆抵押+履约保证保险”
【简答题】实现教材上的过渡、动画和转换效果。
【简答题】间歇操作的设备要排列工艺 和 。
【单选题】Metal-wheeled chariots are the_________of the tanks of modern warfare.
A.
prototype
B.
original
C.
model
D.
sample
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