问题
单项选择题
晶体三极管用于放大时，应使其发射结、集电结处于（）
A.发射结正偏、集电结反偏
B.发射结正偏、集电结正偏
C.发射结反偏、集电结正偏
D..发射结反偏、集电结反偏
答案
参考答案：A
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晶体三极管用于放大时，应使其发射结、集电结处于（）
A.发射结正偏、集电结反偏
B.发射结正偏、集电结正偏
C.发射结反偏、集电结正偏
D..发射结反偏、集电结反偏
参考答案：A
Passage Two
Which of the following is NOT tree of Andrea Doria
A．The ship was luxuriously decorated.
B．The ship was carrying several million dollars.
C．The ship had some precious sculptures on board.
D．The ship has attracted a lot of treasure hunters ever since its sinking.