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About a year ago I was 1 with cancer. I had a 2 at 7:30 in the morning, and it clearly showed a 3 on my pancreas. The doctors told me this was almost certainly a type of cancer that is 4 , and that I should 5 to live no longer than three to six months. Later that evening I had a biopsy, 6 they 7 an endoscope down my throat, through my stomach and into my 8 , put a needle into my pancreas and got a few 9 from the tumor. I was sedated, but my wife, who was there, told me that when they viewed the cells under a microscope the doctors started crying because it turned out to be a very rare form of pancreatic cancer that is curable with 10 .
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【单选题】某正弦电流 i 的有效值为 7 A ,频率 f =100 Hz ,初相位 j = - 60 ° , 则该电流的瞬时值表达式为 ( ) 。
A.
i =7 sin ( 628 t - 60 ° ) A
B.
I =7 sin ( 628 t - 60 ° ) A
C.
i =7 sin ( 628 t - 60 ° ) A
D.
I =7 sin ( 628 t +60 ° ) A
【简答题】已知某正弦电流当其相位角为 时，其值为5A，该电流的有效值是多少?若此电流的周期为10ms，且在t=0时正处于由正值过渡到负值时的零值，写出电流的瞬时值表达式i和相量 。
【多选题】下列属于X连锁隐性遗传系谱特点的是
A.
群体中男性患者远多于女性患者,系谱中的病人几乎都是男性。
B.
双亲无病时,儿子可能发病,女儿则不会发病。
C.
儿子若发病,其母亲一定是携带者
D.
男患者致病基因将来只能传给女儿,女儿全为携带者,存在交叉遗传。
E.
男患者的兄弟、外祖父、舅父、姨表兄弟、外甥、外孙等可能是患者
【单选题】某正弦电流的有效值为7.07A，频率f=100Hz，初相角φ=-60°，则该电流的瞬时表达式为( )。
A.
i=5sin(100πt+30°)A
B.
i=7.07sin(100πt-60°)A
C.
i=10sin(200πt-60°)A
D.
i=7.07sin(100t+60°)A
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