I always like ____________.[ ]
A. to read a book
B. read a book
答案：A
下列哪项是各类休克的共同点（）
A.血压下降
B.后负荷降低
C.前负荷降低
D.皮肤温度下降
E.以上都是
Which type of input is the primary cause of contract changes ？（）
A．Independent estimate
B．Organizational policie
C．Statement of wor
D．Approved changes request
