治疗尿激酶过量引起的出血宜选用：
A．维生素KB．垂体后叶素C．鱼精蛋白D．氨甲苯酸E．以上都不是
参考答案：D
Don’t telephone me at 8 a.m. tomorrow — I ________ a meeting.
A．am having
B．will be having
C．am about to have
D．have had
说明109型分配阀在常用制动位时的作用原理？
