示功图圈闭面积较小，形如黄瓜，并且靠近下负荷线，油井液面、泵效都很高，属于双凡尔漏失。（）
参考答案：错
下列哪个标识符不是合法的标识符
A．7abc
B．＄TRY
C．_ sy V ＄
D．＄PP
They often have problems with______.
A．what will they be able to do
B．what they will be able to do
C．that will they have to do
D．that will they have to do
