腹部叩诊鼓音范围缩小见于()。
A.肝、脾极度肿大
B.胃肠穿孔
C.肠梗阻
D.胃肠高度胀气
E.人工气腹
参考答案:A
Charles is believed_______ the floor yesterday; he is always helping others silently.
A.to sweep
B.to have swept
C.having swept
D.swept
查饲养标准应注意哪些问题?