用刮板输送机运料时,必须有()措施。
A、防止顶倒支柱伤人
B、防止片帮
C、冒顶
D、防滑
参考答案:A
胰腺癌与慢性胰腺炎的超声鉴别诊断,下列不正确的是()。
A.胰腺癌多局限性肿大
B.肿瘤后方回声多衰减
C.胰腺癌胰管多呈不均匀串珠样轻度增宽
D.慢性胰腺炎体积多轻度肿大或萎缩
E.胰腺癌可伴淋巴结肿大及腹水
12.It was in this very village ______ he was born and brought up.
A.where
B.there
C.when
D.That