logo - 刷刷题
下载APP
【单选题】

冲洗结膜囊时冲力不宜太大,一般距离多少为宜()

A.
3~4cm
B.
10~15cm
C.
8~10cm
D.
5~10cm
E.
10~20cm
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】第二篇 Pushbike Peril Low speed bicycle crashes can badly injure—or even kill—children if they fall onto the ends of the handlebars (车把). So a team of engineers is redesigning the humble h...

A.
it is not easy to persuade manufacturers to adopt the new design.
B.
the team of engineers has not found any countermeasures.
C.
children like to ride bicycles at a very low speed.
D.
a lot of children were killed in bicycle accidents in the past 30 years.

【单选题】(2005年)要用冲床在厚度为t的钢板上冲出一圆孔,则冲力大小( )。

A.
与圆孔直径的平方成正比
B.
与圆孔直径的平方根成正比
C.
与圆孔直径成正比
D.
与圆孔直径的三次方成正比

【单选题】结膜囊指的是()

A.
上、下眼睑之间的裂隙
B.
上眼睑与角膜之间的裂隙
C.
下眼睑与角膜之间的裂隙
D.
睑结膜与球结膜之间的裂隙
E.
睑结膜与眶筋膜之间的裂隙

【单选题】胶印机机械运动的冲力除印刷压力外,主要来自()。

A.
滚筒离让
B.
水、墨辊传动
C.
递纸装置的往复
D.
递纸牙往复摆动和滚筒叼牙开闭