林德曼定律
参考答案：
即百分之十定律，能量沿营养级升高而逐渐减少，最高能利用10%。
His wife is constantly finding ____with him,which makes him very angry.
A．errors
B．shortcomings
C．fault
D．flaw
路灯安装高度不宜低于（）m。
A.5
B.4.5
C.3.5
D.2.5
