分件吊装法如何吊装？
参考答案：
四次开行，第一次吊柱，第二次吊梁，第三次屋架扶直，第四次屋面系统吊装。
His writing is so confusing that it's difficult to make out _____ it is he is trying to express. [ ]
A. that
B. how
C. who
D. what
该患者最可能是
A．低钾性麻痹
B．重症肌无力
C．格林-巴利综合征
D．急性脊髓炎
E．多发性肌炎
