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【单选题】
The reason why few airlines want to impose a total ban on their passengers using electronic devices is ______.A.
they don't believe there is such a danger as radio interference
B.
the harmful effect of electromagnetic interference is yet to be proved
C.
they have other effective safety measures to fall back on
D.
most passengers refuse to take a plane which bans the use of radio and cassette players
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【简答题】若电压源的开路电压是12V,其短路电流为30A,则该电压源的电动势为 V,内阻应是 Ω
【单选题】Which type of gas has a pseudo-reduced compressibility?
A.
ideal gas
B.
pure real gas
C.
natural gas
D.
none of the above
【简答题】在确定汽车传动系最大传动比时，除了要考虑最大爬坡度之外，还应考虑（）及（）。
【单选题】Which type of gas has a formation volume factor?
A.
ideal gas
B.
pure real gas
C.
dry air
D.
natural gas
E.
all of the above
【多选题】关于适合纹样图案。说法正确的有:
A.
是受一定外形轮廓制约的图案构成形式
B.
纹样形象必须要适合、服从一定的外形
C.
是自由又独立的装饰纹样
D.
优秀的适合纹样既能很好的适合外形，又不显得拘谨
【简答题】若电压源的开路电压是12V,其短路电流为30A,则该电压源的电源电压为____,内阻应是____。
【简答题】若电源的开路电压是 12 V,其短路电流为 30 A,则该电源的等效电压源电压为 V ,内阻为 Ω ;其等效电流源的电流为 A ,内阻为 Ω 。
【单选题】which type of gas turbine engine provides very limited of jet thrust ?
A.
turboprop engine
B.
turbofan engine
C.
turbojet engine
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