男性,35岁,有胃溃疡病史,今日早餐后,突然上腹痛,拒按,查:腹壁呈板状僵硬,可能为
A.阑尾炎
B.胰腺炎
C.胆囊炎
D.溃疡穿孔
E.肠梗阻
参考答案:D
If we ________ one of the other uploading approaches, the process would have taken longer than one hour.
A.used
B.had used
C.should use
D.would use
矿井应当对防突措施的技术参数和效果进行实际考察确定。