闸阀的特点是结构（），流动阻力（），开启，关闭灵活，但其密封面易于（）。
参考答案：简单、小、磨损
Almost ____ of the students in this class ____ glasses, that is, ____ of them.
A．two thirds; wear; 60 percent
B．two thirds; wear; 60 percents
C．two third; wears; 60 percent
D．two third; wears; 60 percents
注册税务师代理审查企业上年度的纳税情况，对其错账应如何进行调账
