单项选择题
物质的量浓度相同的下列溶液，pH值最大的是( ) A．CuSO4 B．NaHCO3 C．Na2CO3 D．NaCl
单项选择题 We are not ______ a position to accept your offer. A．at B．on C．of D．in
单项选择题 典型硬脑膜外血肿患者的早期瞳孔变化是( ) A．同侧散大 B．对侧散大 C．双侧散大 D．同侧缩小 E．不等圆
单项选择题 It is important that you ______ sports every day. A．have B．would have C．must have D．will have
