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【单选题】
某地一项有关高血压的横断面研究结果表明：男性40~ 49岁组有高血压者占12%，女性占11%。从而得出结论，该年龄组男性患高血压的危险性较女性大。此结论A.
正确
B.
不正确，因为没有区分患病率和发病率
C.
不正确，因为未用率做性别间比较
D.
不正确，因为无对照
E.
不正确，因为没有考虑到可能存在的队列的影响
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【简答题】Basic four operations within a computer ______ .
【简答题】There are three basic operations of logical algebra ________ 、________ 、_________ 。
【多选题】The two basic operations at the DPSK transmitter are ____________.
A.
differential encoding
B.
unipolar nonreturn-to-zero (NRZ) encoding
C.
phase-shift keying
D.
frequency-shift keying
【单选题】As per the standing orders，you should carry out all the following operations except ______ upon having received words that a person has fallen overboard.
A.
call the Master immediately
B.
stop the engines
C.
sound the “Man Overboard” signal of 3 prolonged blasts on the whistle and 3 prolonged blasts on the general alarm
D.
prepare，as many as possible，rescue facilities，including warm clothes
【多选题】The basic morphological operations include:
A.
dilation
B.
shrinking
C.
opening
D.
erosion
【简答题】What are the basic operations of matrices?
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