对螺纹标记说法不正确的是（）。
A.单线螺纹线数省略标注
B.右旋螺纹右旋省略不标注
C.粗牙普通螺纹不标注螺距
D.左旋螺纹左旋省略不标注
参考答案：D
It's nothing unusual to experience failure, and ought we to be so discouraged.[ ]
A. in no time
B. by all means
C. by no means
D. in any condition
患者，男性，75岁，入院评估显示以下资料，请判断属于主观性资料是
A．血压16.3/10.6kPaB．头昏脑涨C．骶尾部皮肤破损1cm×2cmD．膝关节红肿、压痛E．肌张力三级
