心包积液在少于多少毫升时,其心影大小和形态可无明显改变()
A.30ml
B.50ml
C.300ml
D.500ml
E.800ml
参考答案:C
五.短文改错(共10个小题,每题1分)
Yesterday afternoon I went to Green Park. Any 76._________
people were boating in the lake, and among them was 77.________.
a happy family. They were taking photo when suddenly 78.________
a girl fell into the water. She was frightening and her 79._________
parents cried out, "Help!" It is clear that they couldn't swim 80._________
not at all.From a nearby place a young man immediately rushed 81.________
to the lake.Without take off his clothes,he jumped into the 82.________
water and quikly swam to the girl.Finally, he carried her 83._______
to the lake bank.She saved!How happy their parents were! 84.________
After they thought of thanking the young man,he had left! 85._________
某个站点在测试期间手机没有收到该小区的信号。以下原因不正确的为:()
A、该小区没有发射功率
B、由于天线被阻挡导致的
C、该小区收发天线接反
D、该小区驻波比告警