油罐进油前,应提前()h投运采暖管线预热。
A.3
B.2
C.1
D.0.5
参考答案:D
对肩周炎的处理,哪项是错误的()
A.自愈性疾病,无须治疗
B.物理治疗
C.功能锻炼
D.局部封闭
E.非甾体类抗炎药
31.Every solid object______reflect a sound,varying according to the size and nature of the object.
A.must
B.shall
C.will
D.Should