在瘤胃切开术的瘤胃缝合中，首先进行的第一层缝合是（）。
A.库兴式缝合
B.结节缝合
C.螺旋式缝合
参考答案：C
— What do you think of your teacher?
— He often _____ funny jokes and always _____ us _____. [ ]
A. speaks, makes, laugh
B. tells, makes, laugh
C. says, makes, laughing
D. tells, makes, to laugh
A continual worsening of the list or trim of any floating ship indicates（）.
A.negative GM
B.progressive flooding
C.structural failure
D.an immediate need to counterflood
