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【单选题】
只有当所有的检验数 ( )时,该土方调配方案最优方案A.
≤0
B.
<0< /div>
C.
>0
D.
≥0
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【单选题】If little changes in students were neglected by teacher, their interests on study ______ easily.
A.
will be reduced
B.
would be reduced
C.
are reduced
D.
are being reduced
【判断题】首站进、出口压力pZ1或pQ1稍有下降，对整条管道系统的输气量都会有较明显的影响。The slight decrease of inlet and outlet pressure pZ1 or pQ1 in the first station will have a more obvious impact on the gas transmission capacity of the whole ...
A.
正确
B.
错误
【单选题】What is the reason for her to quit Infosys and take up a job in a start-up company?
A.
She wanted empowerment and sought to work with an intellectual pool.
B.
She was better paid in the new company.
C.
She met with problems in her former company.
【单选题】如图所示,xOy是平面直角坐标系,Ox水平、Oy竖直,一质点从O点开始做平抛运动,P点是轨迹上的一点. 质点在P点的速度大小为v,方向沿该点所在轨迹的切线. M点为P点在Ox轴上的投影,P点速度方向的反向延长线与Ox轴相交于Q点. 已知平抛的初速度为20m/s,MP=20m,重力加速度g取10m/s 2 ,则下列说法正确的是
A.
QM的长度为10m
B.
质点从O到P的运动时间为1s
C.
质点在P点的速度v大小为40m/s
D.
质点在P点的速度与水平方向的夹角为45°
【单选题】The new start-up company _________ a large chunk of the market within a year.
A.
carved out
B.
carved into
C.
carved up
D.
carved out of
【简答题】如图所示，位于竖直平面内的坐标系xOy，在其第三象限空间有正交的匀强磁场和匀强电场，匀强磁场沿水平方向且垂直于纸面向外、磁感应强度大小为B，匀强电场沿x轴负方向、场强大小为E。在其第一象限空间有沿y轴负方向的、场强大小为 的匀强电场。一 个电荷量的绝对值为q的油滴从图中第三象限的P点得到一初速度，恰好能沿PO作直线运动（PO与x轴负方向的夹角为θ=37°），并从原点O进入第一象限。已知为...
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