【单选题】The operator who signs the multimode transport document is ____.
A.
only responsible for the first stage of transportation
B.
must be responsible for the whole transportation
C.
is not responsible for transportation
D.
is only responsible for the last stage of the transportation
【单选题】The conditional operator ? : is a ______
【判断题】The operator is usually a woman who works at the General Switchboard.
【简答题】用“五点法”作下列函数在[ 0,2 π ] 上的简图。 ( 1 ) y = sin x ( 2 ) y = sin x +1
【简答题】计算0.10mol/LNH 4 Cl溶液的pH(Kb=1.8×10 -5 )
【单选题】用五点法作y=2sin2x的图象时,首先应描出的五点的横坐标可以是( )
【判断题】PNP管放大电路中,UCC的极性为负,则该管的发射结反偏、集电结正偏。