肠球菌败血症首选:()
A.甲硝唑
B.两性霉素B
C.哌拉西林
D.青霉素(氨苄西林)+氨基糖苷类
E.头孢他啶
参考答案:D
—How is the man injured in the earthquake?
—The doctor said if ________ in a proper way,he was likely to be saved.
A.treated
B.treating
C.is treated
D.to be treated
已知先张法部分预应力混凝土简支空心板梁的跨中截面尺寸如题图所示。计算跨径L0=12.60m。空心板采用40号混凝土,弹性模量Eh=3.3×104N/mm2,预应力钢筋选用亚,其截面面积Ay=1256mm2。已求得预应力钢筋重心处的压应力为零时,预应力钢筋的预应力值σy0=565.86N/mm2。等效工字形截面几何特性:换算截面面积A0=319144mm2,换算截面对形心轴的静矩S0=31725531mm3,换算截面对受拉边缘的截面抵抗矩W0=5.104×107mm3,换算截面对形心轴的惯性矩l0=1。475×1010mm4,截面开裂后的换算截面惯性矩l01=3.642×109mm4,预应力的合力至形心轴的距离e0y=249mm。
预应力钢筋中的预加力为()。
A.710.7kN
B.710.2kN
C.698.21kN
D.745.23kN