脱盐水钠、钾离子含量（）mg/L。
A.≤1
B.≤2
C.≤3
D.≤0.1
参考答案：D
They __________ Mount Emei and will come back next week.[ ]
A. have been to
B. have gone to
C. have been in
D. went to
票据丧失，失票人应当在（）依法向人民法院申请公示催告，或者向人民法院提起诉讼。
A、票据丧失后12日内
B、通知挂失止付后12日内
C、票据丧失后
D、通知挂失止付后3日内
