绝缘油界面张力检测,测试结果不低于()mN/m,则认为试验合格。
A.18
B.19
C.20
D.21
参考答案:B
China’s first spaceman, Yang Liwei, with Shenzhou Ⅴ ______ successfully to earth on Thursday morning after more than 21 hours’ travel along the earth’s orbit.
A. returned backB. arrivedC. reachedD. returned
下述肺隐球菌病特点,错误的是()
A.单发或多发结节
B.空洞、实变并存
C.罕有钙化
D.肺门淋巴结肿大
E.半月征