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【单选题】
油压调节器的作用是( )。A.
使系统油压与进气歧管压力差恒定
B.
防止燃油波动
C.
喷油
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举一反三
【单选题】Today the forests are getting ____________, we must ________ down too many trees.
A.
more and more, prevent people cutting
B.
fewer and fewer, stop people cutting
C.
smaller and smaller, keep people cutting
D.
bigger and bigger, keep people from cutting
【简答题】在图7-32所示电路中，已知：R1=R3=4kΩ，R2=2kΩ，C=2μF，U=20V，换路后电容电流iC的变化规律是（ ）mA。
【多选题】半导体核辐射探测器通常适用于低温条件下,同时也把前放的第一级放大电路置于该低温平台,其目的在于
A.
降低探测器漏电流噪声中的散粒噪声
B.
降低前放第一级放大电路的热噪声
C.
降低探测器漏电流噪声中的低频噪声
【单选题】English ＿＿＿more and more widely (广泛) today. So we must learn it well.
A.
uses
B.
used
C.
is used
【简答题】在图2-32所示电路中,R1 = 2Ω,R2 = 3Ω,E = 6V,内阻不计,I = 0.5A,当电流从D流向A时:UAC = 、UDC = ;当电流从A流向D时:UAC = 、UDC = 。
【单选题】We can infer from the passage that .
A.
children today seem to be more obedient to their parents
B.
children in the 1970s enjoyed more freedom than those today
C.
the author became overprotective under the influence of her mother
D.
the social security back in the 1970s was no better than it is today
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