休克病人的血压明显下降,收缩压低于()。
A、100mmHg
B、60mmHg
C、80mmHg
D、40mmHg
参考答案:C
According to the Audiolingual Method, should dialogues be memorized through mimicry of the teacher’s model Why or why not
计算题:某钻孔深50m,粗径钻具长6.0m,机高1.40m,机上余尺2.50m,需配钻杆多少米?