测绘标准的特征包括()。
A. 科学性
B. 协调性
C. 法定性
D. 时效性
1.2.1 The petroleum consists of organic molecules composed of ( )and ( ).
A. hydrogen
B. carbon
C. hydrocarbons
D. oil and gas
1.2.2 The three forms of petroleum are natural gas, crude oil and asphaltum.
A. 对
B. 错
1.2.3 The petroleum is stored in the pores of the rock.
A. 对
B. 错