古人关于执行关系的观点主要有（）。
参考答案：“知易行难”，“知轻行重”，“行先知后”，“知先行后”，“知行并进互发”
________ enthusiastic about drawing.
A．It seems to be
B．He seems that
C．It seems that
D．He seems to be
开车前应检查信号系统是否灵敏，各部联接螺栓及各部件是否松动，检查破碎机衬板磨损情况。
