Which of the following principles is NOT true in the writing of an invitation card（）
A. Invitation card should be written in the third person
B. The layout of invitation card should be arranged in a decoratively indented form
C. There are no punctuation marks at the end of each line
D. Guests’ names must be printed with their titles
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Which of the following is not one of the occasions for writing a thank-you letter（）
A. for hospitality
B. for presents or contribution
C. for congratulation
D. for apology
You may borrow the book ______ you keep it clean（）
A. as long as
B. when
C. after
D. unless
把RNA转移到硝酸纤维素膜上的技术叫（）
A. Southern blotting
B. Northern blotting
C. Western blotting
D. Eastern blotting
Which of the following biasing combinations is not normally associated with one of the three transistor operating regions（）
A. E-B junction = forward, C-B junction = reverse
B. E-B junction = reverse, C-B junction = reverse
C. E-B junction = reverse, C-B junction = forward
D. All of the above
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