判定肺结核临床类型的主要依据是()
A.肺部体征
B.痰菌检查
C.胸部X线征象
D.结核菌素试验
E.全身中毒症状
参考答案:C
We were about to go outing______ it began to snow heavily.
A.when
B.while
C.as
D.until
当SI上限和SI下限有一值>n3s时,说明该值已在2s范围之外,属“警告”。