交、直流接触器因故障衔铁吸合不上,时间长了,则会使:()
A. 交流接触器铁芯线圈发热,严重时会烧坏线圈,直流接触器则不会损坏
B. 直流接触器铁芯线圈发热,严重时会烧坏线圈,直流接触器则不会损坏
C. 两者铁芯线圈均会发热,严重时线圈均会烧坏
D. 两者虽不能正常工作,但却不会损坏
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男,65岁,无痛性肉眼血尿5个月,B超示左肾盂内肿瘤,尿细胞学检查有可疑肿瘤细胞。进一步检查应首选()
A. CT
B. 膀胱镜输尿管插管收集左肾尿液细胞学检查
C. 膀胱镜左侧肾盂刷取活组织检查
D. 左侧尿路逆行造影
E. MRI
在科技十分落后的古代,人们梦想过许多东西,如千里眼、顺风耳、飞毯、神枪之类,但像现代生活中普及的电话、电视、电脑等,是那时的人们连想都想不到的。这说明,理想具有()
A. 共同性
B. 时代性
C. 阶级性
D. 思想性
You need to design a strategy to meet the company’s requirements for e-mail. What should you do?()
A. Configure and publish a certificate template that is suitable for S/MIME, Deploy a Group Policy object (GPO) so that a certificate that is based on this template is automatically issued to all domain users
B. Specify Group Policy objects (GPOs) and IPSec policies that require all client computers to use Kerberos authentication to connect to mail servers
C. For each mail server, acquire an SSL server certificate from a commercial CA whose root certificate is already trusted
D. Require IPSec encryption on all TCP connections that are used to send or receive e-mail message