单项选择题

A．Because of the bad weather.
B．Because of his young age.
C．Because he lost his way while crossing the ocean.
D．Because he had no partner to help him.

A.Because
B.
B．Because
C.
C．Because
D.
D．Because
E.

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单项选择题

A.3～16
B.3～18
C.2～16
D.2～18

单项选择题

单项选择题

A.局部气压增压
B.触变泥浆减阻
C.管尾增强
D.管道强度增强

A．Because of the bad weather.B．Because of his young age.C．Because he lost his way while crossing the ocean.D．Because he had no partner to help him.