【单选题】振源以原点 O 为平衡位置,沿 y 轴方向做简谐运动,它激发的简谐波在 x 轴上沿正负两个方向传播,在某一时刻沿 x 轴正向传播的波形如图 5 所示。图中所示的各个质点中,振动情况始终与原点的左方的质元 P 的振动情况相同的是
【判断题】A biography is usually filled with rhetorical devices and designed in chronological order.
【多选题】李某,青霉素皮试呈阳性反应,下列正确的是:
C.
在体温单、床头卡或门诊卡醒目注明青霉素阳性标记
【单选题】三相异步电动机采用Y-△起动时,其起动转矩是额定转矩的 __________ 。
【简答题】dif ficult to do or solve
【单选题】A person's chronological age is decided by______.
D.
compared his performance in a test with that of people of the same age
【判断题】When writing a CV, list qualifications and experience in reverse chronological order, starting with the most recent.