前两个月为了去
美国参加一个会议申请了商务
签证，拿到的
签证类型写的是B1/B2，Entries是M，有效期1年。后来会议取消，就没去。另外因为在一家科技公司工作，
签证时做了行政审查，Annotation 里面注了Clearance Received、日期和公司名称。
现在想在
签证有效期内去旅游，可以直接凭此
签证入境吗？入境时要带新的邀请函吗？新邀请函要先给领事馆过目吗？
还有就是这个Clearance Received，入境时会因此受到更严格的审查吗？
我理解既然是B1/B2，那就是兼有商务和旅游的功能，但是在网上又查到这样一个规定：
Clearances for multiple purposes/places: Clearances for business visa travelers are valid for one year from the “CLEARANCE RECEIVED” date. This means that if an applicant returns to the U.S. for the same place and purpose within one year, a new clearance is not required. If an applicant plans to travel to the U.S. for different purposes or places within one year, the applicant should bring all relevant material to his or her first visa interview so that the clearance will cover all of the applicant’s trips. This will eliminate the need to get a new clearance for each trip.
出处：http://www.amcham-china.org.cn/amcham/show/content.php?Id=1121
现在很迷惑，到底应该怎么办？请高人指点一下。
多谢！
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我是去年参加了一个会议，当时的签证的annotation里面写了会议名称；今年要去参加另外一个会议，不知道要不要再办签证了