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【多选题】
PN结在 时导通， 时截止，这种特性称为 。A.
正偏
B.
反偏
C.
单向导电性
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举一反三
【简答题】(2013·天津，6)We have launched another manmade satellite，________is announced in today's newspaper. A．that B．which C．who D．what
【单选题】We have launched another man-made satellite, ______ is announced in today’s newspaper.
A.
that
B.
which
C.
who
D.
what
【单选题】We launched an extensive attack； there was nothing for the enemy to do but ___.
A.
surrendering
B.
surrendered
C.
surrender
D.
to surrender
【单选题】(2013·天津，6)We have launched another man－made satellite，________is announced in today's newspaper.
A.
that
B.
which
C.
who
D.
what
【单选题】A big step _____ to strengthen China's health care systems since we launched an effort in 2008. [ ]
A.
has been taken
B.
is being taken
C.
was taken
D.
had been taken
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