接入380V配电网的储能系统，当接入点频率低于（）HZ时，应停止充电。
A.49.5
B.49.6
C.49.7
D.49.4
参考答案：A
—You haven’t got the textbook for my chemistry yet.
—I know, and we ________ to get it for the last five weeks.
A．will have been trying
B．have been trying
C．will be trying
D．had tried
目前销售的智能机畅销机型有哪些？
A.MOTOXT800
B.华为C8500
C.中兴N600
D.三星I909
E.三星W899
