【单选题】淘宝商城正式宣布更名为 “天猫”的日期是
【判断题】旋转钻机分长螺旋钻机和短螺旋钻机两种。( )
【单选题】Even after he ______ as the most valuable employee, he could not gather enough courage to ask his boss for a raise.
【单选题】The doctor in Singapore performed a valuable service by______.
A.
finding the subgroup of the virus
C.
keeping his patients apart from others
D.
reporting the outbreak to Geneva
【单选题】以下对二维数组a 的正确说明的语句是( )