拉铲挖土机的开挖方式是( )。
A．正向挖土，侧向卸土
B．正向挖土，后向卸土
C．沟端开挖，沟侧开挖
D．后向挖土，侧向卸土
参考答案：C
-----He ought to have been warned of the danger.
----- ______ ,but he just wouldn’t listen to me.
A．So ought he
B．So he was
C．So he was
D．So he had
大肠癌的化疗适应证有
A.早期大肠癌
B.术前或术中
C.DukesB期结肠癌
D.晚期不能切除或有远处转移
E.DukesC期结肠癌和DukesB期直肠癌(不易根除者)
