潮式呼吸的特点（）

A.由浅快到深慢，再由深慢到浅快

B.由深慢到深快，再由深快到深慢

C.由浅慢到浅快，再由浅快到浅慢

D.由深快到深慢，再由深慢到深快

E.由浅慢到深快，再由深快到浅慢

After riveting is completed, the joints on the shell of a vessel are generally made watertight by（）.

A.faying

B.caulking

C.felt or canvas packing

D.red lead