93#车用乙醇汽油与93#车用汽油相比，93#车用乙醇汽油有（）的特点。
A.吸湿性较强
B.清洁性差
C.抗爆性能差
D.污染大
参考答案：A
常温时，下列各组离子在指定溶液中能大量共存的是（ ）
A．pH=1的溶液中：Fe2+、NO3-、SO42-、Na+
B．c（Fe3+）=0.1mol/L的溶液中：K+、ClO-、SO42-、SCN-
C．c（H+）/c（OH-）=1012的溶液中：NH4+、Al3+、NO3-、Cl-
D．由水电离的c（H+）=1×10-14mol/L的溶液中：Ca2+、K+、Cl-、HCO3-
Robert often asks us his Chinese, so his Chinese is much better than before.[ ]
A. help him
B. to help him with
C. to help with
D. helps him with
