手攻螺纹时，每扳转绞杠一圈就应倒1/2圈，不但能断屑，且可减少切削刃因粘屑而使丝锥轧住的现象发生。
参考答案：对
对睾丸性索间质肿瘤的描述错误的是（）
A.是由胚胎时的原始生殖嵴发育而来
B.可出现男性女性化体征
C.睾丸可发生卵泡膜细胞瘤
D.若间质细胞瘤细胞异型性大、核分裂象多见，可以诊断为恶性间质细胞瘤
E.Sertoli细胞瘤vimentin和CK常阳性
During the first 48 to 72 hours of fluid resuscitation therapy after a major burn injury, the intravenous infusion rate will be adjusted by evaluating which of the following observation
A. Daily body weight.B. Hourly urine output.C. Hourly urine specific gravity.D. Hourly body temperature.
