大直径跑绳采用大接方法，外观虽好，但有不少实质上的断股，且浪费钢绳，应于拚弃。
参考答案：对
Jack was in low spirits those days and his friends did all they could _____ him up.
A．cheer
B．cheering
C．cheered
D．to cheer
针对卡介苗的特殊禁忌证是（）。
A.严重湿疹
B.腹泻
C.消瘦
D.低热
E.惊厥
