慢性泪囊炎急需行内眼手术者可选择（）
A.泪道探通
B.泪道冲洗
C.泪囊摘除术
D.泪囊鼻腔吻合术
参考答案：C
Travelers that they should bring their ID cards with them.
A．have reminded
B．are reminded
C．were reminding
D．had been reminded
如图所示，弹簧测力计的示数为_____N，由此可算得该物体的质量为_____kg．
