膀胱肿瘤最多发生的部位是
A．膀胱三角区
B．颈部
C．两侧壁及后壁
D．底部
E．顶部
参考答案：C
计算：cos30°tan30°+sin60°tan45°cot30°=______．
His sacrifices for the country were never officially , which made all of us feel discouraged.
A．acknowledged
B．appealed
C．recommended
D．evaluated
