与十进制数254等值的二进制数是
A.11111110
B.11101111
C.11111011
D.11101110
参考答案:A
解析: 十进制与二进制的转换可采用“除二取余”数。
下列说法正确的有()。
A.样方地大小需依据植株大小和密度确定
B.样方调查主要是进行物种调查和覆盖度调查
C.一般可用物种与面积和关系曲线确定样地数目
D.自然植被经常需要进行现场的样方调查,一般草本的样地在10m2以上
Construction of the gigantic office building in this city was for years intermittent .
A.stopping and starting at intervals
B.something that will happen soon
C.being watched with keen interest
D.anything that comes and goes