所谓压缩比是指铸坯横断面积与轧材横断面积之比。
参考答案:对
-----What a fine day! Shall we go picnicking?
------_____________,but we need to be home before six o’clock for the football match. .
A.Have a nice time.
B.Pardon me
C.That’s great
D.You are right
不属于结肠镜检查并发症的是()。
A.腹胀
B.肠出血
C.肠穿孔
D.肠系膜撕裂
E.腹膜后气肿