诊断肺结核最可靠的依据是()
A.结核中毒症状及明显的呼吸道局部症状
B.胸片:锁骨上下浸润性病灶及空洞形成
C.5单位结素试验强阳性
D.痰中找到结核菌
E.血沉明显增快
参考答案:D
If it ______________ tomorrow, I would stay at home watching TV.
A.should rain
B.rains
C.was to rain
D.will rain
何谓加工精度?何谓加工误差?两者有何区别与联系?