[判断题]电流互感器和电压互感器的二次绕组应有一点且仅有一点永久性、可靠的保护接地。
A.正确
B.错误

{{B}}Questions 47 to 56 are based on the following passage.{{/B}}
People who have{{U}} (47) {{/U}}difficulty with reading, writing, listening or working with numbers might have a learning disability. We talked last week about a reading disorder, dyslexia (说话障碍) . Today we discuss a{{U}} (48) {{/U}}disorder, dysgraphia (书写困难) .
Writing is not a (an){{U}} (49) {{/U}}skill. Not only does it require the ability to organize and{{U}} (50) {{/U}}ideas in the mind, it also{{U}} (51) {{/U}}the ability to get the muscles in the hands and fingers to form those ideas, letter by letter, on paper.
Experts say teachers and parents should suspect dysgraphia if a child’s handwriting is unusually difficult to read. Letters might be sized or spaced incorrectly. Capital letters might be in the{{U}} (52) {{/U}}places, The child’s hand, body or paper might be in a strange position. These can all be signs of dysgrapbia.{{U}} (53) {{/U}}probl