题目内容

（）thatkindofweatherpersist，itwouldbeverylikelythatthetwoshipswouldtoucheachother.

A. If
B. Providedthat
C. Should
D. When

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A. On
B. At
C. During
D. In

A. thehighestpointinthesystem
B. thelowestpointinthesystem
C. nearthefloor
D. platelevelornearthetanktoplevel

A. camshaftbeatings
B. mainbearings
C. pistoncrowns
D. cylinderwalls

A. openlateandcloseearly
B. openlateandcloselate
C. failtoopenwhentheengineiscold
D. failtoopenatnormaloperatingtemperature