农村沼气发酵原料的碳氮比一般控制在多少范围内合适？
参考答案：
农村沼气发酵原料的碳氮比一般在20～30∶1的范围。
A client who has sustained a head injury is to receive mannitol (Osmitrol) by IV push. In evaluating the effectiveness of the drug, the nurse should expect to find
A. increased lung expansion.B. decreased cerebral edema.C. decreased cardiac workload.D. increased cerebral circulation.
若有定义：char*st="how are you"；，下列程序段中正确的是
A．chara[11]，*p；strcpy(p=a+1，&st[4])；
B．chara[11]；strcpy(++a，st)；
C．chara[11]；strcpy(a，st)；
D．chara[]，*p；strcpy(p=&a[1]，st+2)；
